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LEASES - Narrative (Details)	12 Months Ended
	Dec. 31, 2020 option contract
Leases [Abstract]
Number of finance lease contracts | contract	2
Number of sublease extension options | option	0

X

- Definition

Lessee, Finance Lease, Number Of Lease Contracts

+ References

No definition available.

+ Details

Name:	crc_LesseeFinanceLeaseNumberOfLeaseContracts
Namespace Prefix:	crc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Lessee, Sublease, Renewal Option

+ References

No definition available.

+ Details

Name:	crc_LesseeSubleaseRenewalOption
Namespace Prefix:	crc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_LeasesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration